Phonographic attachment.



E. gmcno'mA ng 1T. PHONOGRAPHIC ATTACHMENT.

APPLICATION FILED JUNE 26, I916.

Patented Feb. 27,1917.

. 2 SHEETS-SHEET I.

6Z1. Zak J:

5., F. .McUONALD, JE PHONOGRAPHIC ATTACHMENT. APPLICATION HLED JUNE 26. I916.

1,217,794 'I atented.Feb.27,1917.

2 SHEETS-SHEET 2.

e amm mrmni. Patented Feb. 27,1917 I a ncauoaaia June 26,1916. Seria11to.165,98i..

'TocZZ whpmitmay concern: I

Beit known that I, EUGENE F. MoDoN- ALB, J12, a citizen of the United States, residing at Chicago, in the county of Cook and State of'Illinois, have invented certain new and useful Improvements in Phonographic Attachments, of which the specification.

The attachment-of this invention is designed to act as an adjustable stop member,

for limiting theoutward throw of the tone arm of a phonograph, and' for imparting a slight inward thrust thereto sufiicient, when the disk record is in position and rotating, to throw the needle into engagement with the beginning of'the record line.

In the operation of phonographs, difiicult-y and inconvenience is oftenexperienced is finally positioned on the surface of the disk; and when properly positioned onnthe surface, it often becomes necessary to man ually move the needle inwardly in order to bring it into engagement with the beginningpl of the record line. V

The present invention provides an adjustable stopfor limiting the outward swing of the tone arm, which is made adjustable in, order to accommodate the device to records of different diameters. The device; further. more, embodies a spring-pressed member for inwardly thrusting the arm when the needle is positioned on the surface of the record, but with such a slight spring action that no' transverse movement across the record will be occasioned until the record is rotated, the weight of the needle resting on a stationary. record being suiiicient'"to' pre-' vent movement under the impetus of the spring. i

In thedrawings:

Figure 1' 's a'perspective view of the tone arm, turntable, and associated parts of a I Victor phonograph, shown by way of illustration; together with the device of the present invention:

the device adjusted foi use in connection svltha ten inch record and projected position;

following is a ing in the main with those previously described. 1

in its inwa rdly Fig. 3 is a similar view showing thedevicea adjustable for a twelve inch record andin its outwardly projected position;

Fig. 4 is a section taken on line i4 of Fig. 2, looking in the direction, ofthe arrow;

Fig. 5' is. a sectional view taken on the line 55 of Fig. 3, looking in the direction. of-the arrow; v Fig. 6 is a slight modification with'additional stop devices provided for use in connection with the smaller size records Fig. 7 is a perspective view similar to Fig. 1, showinga modified form of mounting for the device; and

Fig. 8 is a modification of the device bf. "Fig. 1.

. within a socket 1O screwed or otherwise seis further supported in its in and out swivel fmovements by means of a standard 13 which springs from the socket 10, and carries at its upper end a pin 14 which enters a bearing 15*located on the bend of the tone arm. The sound box carries the usual needle socket 16 which receives the end of a' needle 17, which latter bearsdownwardly on the surface of the disk recur-(1'18 carried by the turntable l!) in the usual manner. In the above arrangement, the working parts serve merely for purposes of illustration, being those which are employed in the Victor 'ahonograph, although the present invention is adapted for use with any make of phonograph employingipaits correspond- The attachment of the present invention,

in the-form shown in Fig; 1, employs a base standard. 20 preferably made of sheet metal and bent to afi'ordtwo side leaves'21 con i l nected at the bend orangle 22, and spread I F 1g. 2 is a side VIEW partly lll section of" at'their lower ends 23 23 to afford 'a base fonattaohment to the topof the phonographcasmg. The standard affords a mounting wise formed or sheetmetal to form side leaves or sections 25 connected at the bend or angle 26. The side leaves ,or sectionsof the stop member at its lower end are extended in the center to'afford pivot ears 2-7 which are struck inwardly to contact one another and. to lie between the sections or leaves of the base standard 20, to which they are pivoted by means of a pivot pin 28.

The leaves or sections of the base memher and stop member lie in the same plane,

. and the meeting edges of one or both of the members are cut or beveled to afford a slight clearance between the edges, so that the latter will not lie in complete edgewise contact with one another, but will rather allow for a slight rocking movement of the stop membersufiicient to permit the latter to be moved from the initial position shown' in Fig. 3 inwardly to the final position shown in Fig. 2. The arrangement, however, is one which affords means for limiting the movement in both directions, so. that only enough movement will be permitted to swing the tone arm inwardly to the degree necessary to insure engagement of the needle with the record lme.- Since the blank marginal space on diflerent rec-' ords is variable, it is necessary that the degree of movement afforded to the rocking stop member be sufficient to swing the arm.

over a record having a maximum width of marginal blank.

llhe forward ends of the leaves or sections of the rocking stop member are outwardly end of which is hooked into the base stand-' ard. and the other end into the rocking stop member, which arrangement will lmpart a limited inward'thrust to the stop member and thus tend to swing the tone arm, in toward the center. The amount of movement allowed to the rocking stop member need be very slight, since the-- stop may be located at such a position with respect to the pivotal center of the arm that the slight needle to the desired degree.

The above description applies to a rocking stop n'icinber designed only for use in connection with records of a single size, but in order to adapt the device for use with records of varying size, one or more extension stops are provided. Figs. 2, 3, andd the limit of movement i-llustrate'the use of 'a single one of such extensions 81 [which is carried between the leaves or halves of the rocking stop member, and is mounted to swing upon a pivot 32 located at or near the bend of the rocking stop member, which pivot permits the stop extension to be moved from the projecting or active position shown ill/Fig. 2 into thev non-active or vertical position shown in Fig 3, and in order to limit the retracted movement of the extension, the halves or leaves of the rocking stop member are in; wardly struck at the proper point to afford stop lugs 33 against which the "lower edge of the extension is adapted to strike when so i isreached. The movement in the opposite direction is limited by contact of the, rear end. of-the extension member with'the connecting bend or angle 26 of the rocking stop member.

The above is a simple and convenient arrangementfor the stops, although cross pins or the like might be employed for a similar purpose. As shown iirlfigs. 2, 3, and 4-, the extension. of these figures is formed from a double thickness of metal, the sections being folded and pressed together into contact with one another. This arrangement permits the end portion of the two sections to be oppositely bent' to aflord companion stop as flanges, 3st, although a single thickness of metal might be employedand a single stop flange provided without altering the character of the device in any material degree. Such a construction is shown in Fig. 6, in "111 which three extension stop members 35, 36, and 37, respectively, are employed, each of which is provided I with but a single stopv flange extending in one direction only, and

this construction may be employed. where it is desired't-o adapt the device for in connection with the small and eight, inch records now being manufactured and sold extensively. v v

Fig. 7 shows a slight modification in which the movable parts heretofore do scribed are mounted upon a bracket arm 38 which is connected with and outwardly pro jects from the standard 13; and this arrangement may be considered more desirable where the phonograph is initially equipped with the device of. the present invention, and where it is not deemed desirable to mar the woodwork of the case by thescrew-l-mles required in attaching the device in the manner shown-in Fig. l. rocking movement will be snthciently ac- (-cntuated at the end of the arm to move the In Fig. 8 is shown'a slight rearrangement of the opera t ng parts, although the general varrangementand mode of operation is quite similar. In Fig. 821 stop member 39 is made rigid. although quite similar in shape and general arrangement to the articulated member previously described. 3 The rigid member 391s provided at its inner end with sto flanges 40 similar to those heretofore "described, and one or'more' may be employed which are pivoted to-the pivot pin 42 in a manner identical with that previously described. In fact the constructli on and arrangement of 'the stop: device of 1g. would result if the joint of Figs. 1 to 6 were eliminated. In order, however, to afford the necessary spring action to insure contact-of the needle with the record line, the tone-arm is provided with a clamping ring 43 which carries a hinged contact arm 44 whi'ch is con-' tacted by a spring 45, the arrangement being one which serves to. afford a thrust against the rigid stop member, and thereby tend to move the tone arm and needle across the surface of the disk when rotating. I

In use the device of either of the forms described. will be so located andpositioned with respect to the tone arm permit the needle to be dropped down onto the surface of the disk near the extreme edge thereof, but the parts are so arrang and proportioned as to prevent the arm from being swung outward suiiicientlyv to drop the needle down past the edge of the disk, the device affording arstop which insures contactpvi-th the surface of the disk. Thereafter whenthe operator releases the arm, the slight sprin'g action move the needle suiiiciently to engage the beginning of the record line. (here records of different sizes are employed, the extension stbps can be used and instantly adjusted to meet the changed conditions, sothat the instrument can be operated without the trouble and annoyance which is frequently experienced in the effort to properly adjust the needle to the surface of the record. This is particularly noticeable where insuflicient light is afforded to enable theoperator'to clearly ascertain the position of the needle.

In the present case, however, accidental displacement of the needle is prevented and immediate contact with the beginning of the record line is insured,

- ,width of the blank marginal space which.

varies considerably in different records.

Although the device has been describe with considerable particularity as to detail, it is obvious that the device need not be made of sheet metal in precisely the way described, and various modifications in structure and'detail may be made without departing from the spirit of the invention.

I claim: a

1. Incombination with a swinging tone arm, needle and associated parts ofa phonograph, a main stop device adapteo to limit the outward swing of the arm to insure contact with the record surface, and an extension stop pivoted to the main stop device and adapted when moved to pro ected position 'to' lie in acting relation with the tone arm and adapted to be swung at will on its extension stops 4 =1 8 is precisely similar to that which that it will d with the record surface,

afi'ordedwill serve to irrespective of the.

.pivot to retracted position to expose the main substantially as described.- v

2. In combination with a swinging tone arm, a needle, and associated parts of. a phonograph, a stop device pivotedin position to swing'toward and from the record and restricted in its outward movement to limit the outward swing of the arm to insure contact of the needle with the recordsurface, and a spring for normally holding the stop device in its inward position for inwardly thrusting the tone arm to insure engagement of the needle with the beginning of the record line, substantially as described.

3. In combination with a swinging tone arm, a needle, and associated parts of a phonograph, a stop tal pivot in position to swing toward and from the record and restricted in its outward movement to limit the outward swing of the arm to insure cont'act of-the needle mally holding the stop device in its inward position for inwardly thrusting the tone arm to insure engagement oftheneedle with the beginning of the record line, andan extension stop connected to the stop device and movable into projected or retracted posithe device for use with tions, and adapting substantially as records of different sizes, described.

-' 4. Incombination with a swinging tonev and associated parts of a phonoarm, needle, graph, a pivoted stop device adapted to limit the outward swing tact of the needle with the record surface, a spring for imparting an inward movement stop device to co-act with the tone arm,

device pivoted on a horlzona springfor norof the arm to insure conto the stop device for inwardly thrusting v the tone arm to insure engagement of the needle with the beginning of'the record line, and an extension stop pivoted to the stop device and adapted to be moved at will into rojected or retracted position, mg the device for use with records of different sizes, substantially as described.

5. In combination with a swinging tone arm, needle, and associated parts of a. pho-.

d nograph, a stop idei ieeeeenslstmg of a base the stop member to insureand adaptagainst the tone arm and to limit .the outward movement of the arm, and a spring for inwardly. rocking the stop member to insure contact of the needle with the beginning of the record line, the spring having sulli-' supporting member. a; rocking stop pivoted to the base member and adapted to bear- 'agamst the t mearm and to l mit the out-' ward movement of the arm, a'spring for inwardly rocking the stop member to insure contact of the needle with the beginning of the record line, and an extension 15 stop connected to the rocking stop and adapted to be moved at will into and out of extended position, and adapting the device for use with records otdilterent sizes, substantially as desczfibedf i 2O In eombinatnm with a swinging tone arm, needle, andassoeiated parts of a phonograph, a stop device consisting of a base sup 'lorting member, a rocking stop pivoted to. the base'n'iembc'r and adapted to bear against the'tonearm and to limit the outward movement ofthe-arm, a spring for in- \vaidlf'i'ocking the stop member to insure contact of the. needle with the beginning of the record line, and an extension stop piv- 3 oted to the rocking stop and adapted to be moved at will into and out of extended position, and adapting the device for use-with records of different sizes, substantially as described.

9. In combination with a swinging tone arm, needle, and associated parts of a phonograph, a stop device consisting of a base supporting member formed of two sections or leaves connected together, a rocking stop of over-hanging formation consisting of two sections or leaves connected together, and provided with pivot ears struck inwardly and pivoted between the sections of the base member, the adjoining edges of the two members acting to limit the rocking movement of the stop member in both directions, and a spring connecting'the rocking stop member with the base member for imparting an inward thrust to the rocking stop member, substantially as described.

10. In combination with a swinging tone arm, needle, and associated parts of a phonograph, a stopdevice consisting of a base supporting member forn'ied of two sections or leavesconuected together, a rocking stop of over-hanging formation consisting of two sections or leaves connected together, and provided with pivot ears struck inwardly and pivoted between the sections of the base member, the adjoining edges of the two members acting to limit the rocking movement of the stop member in both directions, a spring connecting the rocking stop member with the base member for imparting an inward thrust to the rocking stop member, and an extension stop pivoted between the leaves or sections of therocking stop member and adapted to be moved either to a projected or retracted position to adapt the device for use with records of different sizes, substantially as described.

EUGENE F.-MCDONAIID, JR.

Witnesses:

SAMUEL l/V. BANNING, 'FnANoEs M. Fnos'r. 

